Learjet 60 - Control Display Unit (CDU)

Learjet 60

Pilot's Manual
This
switch is used to disable the on-side RTU . In the nor-
malmode, the RTU will control the on-side radios . When
switched to the OFF mode, the RTU will blank and all ra-
dios will be controlled by the cross-side RTU . This would
be used if the on-side RTU fails .
OFF
OFF
R l+fl T

'i
Tore
This switch is installed only if a Collins (single or dual)
FMS is installed and is used to disable remote tuning of all
radios via the CDUs and FMS autotune functions . In the
normal
mode, the radios may be controlled by the RTU,
CDUs or FMS autotune function . When switched to the
OFF mode, only the RTUs may be used to control the
radios .
CONTROL DISPLAY UNIT (CDU)
Either dual Collins or UASC-CDUs are installed in the pedestal to con-
trol the PFDs, MFDs, FMS, and weather radar . The CDUs also provide
an additional
method (other than the RTUs) for tuning NAV/COM ra-
dios and entering transponder codes . The CDU uses a combination of
displayed menus, line-keys, full alphanumeric keypad, control knobs
and dedicated control keys . In most cases, the CDUs can be operated
simultaneously
or independently
.
For instance, the pilot may change or
edit the flight plan while the
copilot
controls the
weather radar or
manages NAV/COM frequencies . Neither CDU has priority over the
other . If both CDUs tune the same radio, the most recent change is the
one that will be used . The pilot should note that there are some func-
tions that cannot
be done simultaneously
.
In addition to the UASC
CDUs, two ERPs are installed . The UASC CDU/ERP combination re-
places the Collins CDU with operation remaining similar .
PM-123
Change 4
5-39